Be quiet, boys and girls! It’s time for class. __________ Unit 3 in your books.

I haven’t seen you for a couple of daysWhat have you been up _____? [ ]

Mary’s father seldom has breakfast at home, — . He has it on his way to work.

The project is based on an agreement, one of ________ purposes is to ensure that the project can be accomplished before the deadline.

Listen! Is Professor Johnson giving a report in the hall—No, it be him. He has gone to Japan.